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Preheat oven to 375 F. Prepare 2 pieces of parchment paper or foil for papillotes.
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*
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Open the papillotes and place a chicken breast in the center of one half of each opened paper heart.
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Spread 1 teaspoon of mustard over each chicken breast.
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Distribute leeks and carrots evenly over the chicken.
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Season with salt, pepper, and thyme; drizzle with olive oil.
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7
I didnt completely seal my papillotes, I simply folded them up and flipped them over, seam side down, into an 8x8 inch baking dish.
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Put potato cubes into a foil packet.
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Season with salt, pepper, thyme, 1 teaspoon of mustard (if desired) and drizzle with about a Tablespoon of olive oil.
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Place on baking sheet in oven along with the chicken papillotes.
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Bake until the packages are puffed, about 30 minutes.
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12
Since my packets were not tightly sealed they didnt puff up, but nothing leaked out into the baking dish.
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Open one package to check that the chicken is done (open the packet and stick a meat thermometer in the chicken, it should be at least 165F).
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Next, check the potato packet.
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15
My potatoes were not quite fork tender, so I put them back in the oven to bake another 15 minutes.
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Open the packets and combine the chicken and veggies in the baking dish, add the lemon juice and zest, tossing to coat.
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Serve.
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* To prepare a papillote: Cut a piece of parchment paper or foil about 12x16 inches.
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Fold in half so you have an 8x12 inch rectangle, then cut into a half-heart shape as you would a Valentine.
